{"id":"CVE-2026-80700","title":"drm/vmwgfx: validate external BO copy bounds for both stride paths","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: validate external BO copy bounds for both stride paths\n\nvmw_external_bo_copy() trusts caller-supplied offsets, strides, and\nheights and operates on imported…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4 < 4e0f669e2951b742239c6fe847fcc406fe78748d","Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < e7b25a6011781ebfdbc458552cae6d4156732771","Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < 042ca38779554687fc32b66a28328e0d9a36c58f","Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < 5e4a2d15637a906cbd9bc98e0bf969f5f713e344","Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < 706c93c5813caabbb0d0a576c017d15aeec2c113","Linux 5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854","Linux >= 6.6.49 < 6.6.151","Linux >= 6.10.8 < 6.11","Linux 6.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:20:14.904770Z"},"published":"2026-08-28","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:26:33.894Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80700","references":[{"url":"https://git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d"},{"url":"https://git.kernel.org/stable/c/e7b25a6011781ebfdbc458552cae6d4156732771"},{"url":"https://git.kernel.org/stable/c/042ca38779554687fc32b66a28328e0d9a36c58f"},{"url":"https://git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344"},{"url":"https://git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02257,"ingestedAt":"2026-10-16T19:46:24.306Z","slug":"CVE-2026-80700","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: validate external BO copy bounds for both stride paths\n\nvmw_external_bo_copy() trusts caller-supplied offsets, strides, and\nheights and operates on imported dma-buf vmaps:\n\n  - The equal-stride memcpy() bound was clamped after subtracting the\n    offsets from dst_size and src_size; an offset larger than the BO\n    size wraps the unsigned subtraction to a huge value and the\n    resulting memcpy() runs off the end of the vmap.  dst_stride *\n    height is also a u32 multiplication that can overflow.\n  - The non-equal-stride row-by-row path had no bound at all.  The\n    loop touches bytes through offset + (height - 1) * stride +\n    width_in_bytes, with only a WARN_ON(dst_stride < width_in_bytes),\n    and could likewise step past the end of either mapping.\n\nThe offsets and strides are derived from STDU/SOU plane state, so a\nconfigured CRTC submitting a crafted atomic commit on an imported\nframebuffer can reach this path.\n\nValidate the exact row-copy endpoint against each BO's size up front\nusing check_mul_overflow() and check_add_overflow().  Use the bulk\nmemcpy() path only when width_in_bytes covers the whole stride;\notherwise copy one row at a time so partial-row updates near the bottom\nof a framebuffer remain valid.  Also reject zero strides and stride <\nwidth_in_bytes, both of which the row-by-row path cannot represent\nsafely.\n\n## Affected\n\n- `Linux >= 9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4 < 4e0f669e2951b742239c6fe847fcc406fe78748d`\n- `Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < e7b25a6011781ebfdbc458552cae6d4156732771`\n- `Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < 042ca38779554687fc32b66a28328e0d9a36c58f`\n- `Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < 5e4a2d15637a906cbd9bc98e0bf969f5f713e344`\n- `Linux >= 50f1199250912568606b3778dc56646c10cb7b04 < 706c93c5813caabbb0d0a576c017d15aeec2c113`\n- `Linux 5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854`\n- `Linux >= 6.6.49 < 6.6.151`\n- `Linux >= 6.10.8 < 6.11`\n- `Linux 6.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}